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VIDYASHILP ACADEMY HR. SEC. SCHOOL, REWA, Session 2021-22, , PA-2 EXAMINATION, Class – 9th, Time: 90 Minute, , Science, , M.M. 40, , Instructions:, Section A contains 8 Questions & each Question carry 1 mark, , Section B contains 6 Questions & each Question carry 2 marks, , Section C contains 5 Questions & each Question carry 4 marks, , All Questions are mandatory, Section A, Q.1 Multiple choice Questions., (a), Two particles are placed at some distance. If the mass of each of the two particles is, doubled, keeping the distance between them unchanged, the value of gravitational, force between them will be, (i), 1/4 times, (ii), 4 times, (iii) 1/2 times, (iv) Unchanged, (b), Two substances A and B were made to react to form a third substance A 2B according, to the following reaction. 2A+B→A2B, Which of the following statement concerning this reaction are incorrect?, (1), The product so, cannot be classified as a compound., (2), The product will always have a fixed composition., (3), The product so, formed is an element., (4), The product A2B shows the properties of substances A and B., (i), 1,2,4, (ii), 1,2,3, (iii) 1,3,4, (iv) 2,3,4, (c), The amphibians of the plant kingdom are:, (i), Bryophytes (ii), Pteridophytes (iii) Gymnosperms (iv) Angiosperms, (d), Number of species that are known and described lie between, (i), 1.2 - 1.3 million, (ii), 1.4 - 1.5 million, (iii) 1.6 - 1.7 million, (iv) 1.7 - 1.8 million, (e), The correct order Which describes the true solution, colloidal solution and suspension, in the order of their increasing stability is, (i), Suspension < Colloidal solution< true solution, (ii), Colloidal solution < True solution < suspension, (iii) True solution < colloidal solution < suspension, (iv) Colloidal solution < suspension < true solution, (f), 7g of iron were mixed with 7g of sulphur and the mixture was heated in a china dish, till no further reaction took place. The product in the dish will contain, (i), Only iron sulphide (Fes), (ii), Iron sulphide + iron, (iii) Iron sulphide + sulphur, (iv) Iron sulphide + iron + sulphur, (g), Mollusca is the ____ largest phylum of animal kingdom., (i), First, (ii), Second, (iii) Third, (iv) Fourth, , (h), , VSAHSS, , Which of the following is not correct according to Dalton's atomic theory?, (i), Matter is made up of atoms, (ii), Atoms of all substance are identical in all respects, (iii) Atoms combine in a simple whole number ratio, (iv) Atoms of two elements can combine to form more than one compound, , Page 1

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Q.6, Or, Q.7, Or, Q.8, Or, Q.9, Or, Q.10, Or, Q.11, Or, Q.12, , Or, Q.13, Or, Q.14, Or, Q.15, , Or, Q.16, , Or, , Section B, Which organisms are called primitive and how are they different from the so called advanced, organism?, What are the advantages of classifying organisms?, Write the formula to find magnitude of the gravitational force between the earth and an, object on the surface of earth?, What do you mean by free fall ?, Define saturated solution?, Salt can be recovered from its solution by evaporation. Suggest some other technique for the, same?, Define atomic mass?, Define molecular mass?, How are the criteria for deciding divisions in plants different from the criteria for deciding, the subgroups among animals?, Explain the basis for grouping organisms into five kingdoms., Write the applications of centrifugation technique?, Write the name of all type of tanks used during purification system of water?, Section C, A geostationary satellite is orbiting the earth at a height 5R above the surface of earth, where, R is radius of earth. Find the time period of another satellite at a height of 2R from the, surface of earth, The gravitational force between two objects is F. How will this force change when,, (a), Distance between them is reduced to half?, (b), The mass of each object is quadrupled?, Differentiate between dicotyledons and monocotyledons, Write four differences between Bryophytes and pteridophytes., Write the postulates of Dalton's atomic theory?, Write drawbacks of Dalton's atomic theory?, A bus falls off a ridge and drops to the ground in 0.5 sec. Let g = 10 m/S2, Find - (a), What is its speed on striking the ground?, (b), What is its average speed during the 0.5 second?, (c), How high is the ridge from the ground?, The mass of earth is 6×1024 kg & that of moon is 7.4×1022 kg. If the distance between the, earth and the moon is 3.84×105 km. Calculate the force exerted by the earth on the moon?, Give reason:, (a), Animals of phylum platyhelminthes are called flatworms., (b), Bryophytes are called amphibians of the plant kingdom., (c), Fungi are called saprophytes., (d), Bacteria and tapeworms are very different in their body design., Ashu is having a beautiful pet dog 'Pego'. One day, he observed a small insect between his, pet's toes. He removed it carefully from the toe and observed it curiously and correlate with, the insect with the chapter "Diversity in Living Organisms'' which was being taught in the, school., Read the given passage and answer the following questions:, (a), Identify the phylum to which the insect belong to., (b), Enlist any two characteristic features of this phylum., (c), Comment on the behavior of Ashu., , VSAHSS, , Page 2